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Estimating high frequency energy radiation of large earthquakes by image deconvolution back-projection.
- Source :
-
Earth & Planetary Science Letters . Sep2016, Vol. 449, p155-163. 9p. - Publication Year :
- 2016
-
Abstract
- High frequency energy radiation of large earthquakes is a key to evaluating shaking damage and is an important source characteristic for understanding rupture dynamics. We developed a new inversion method, Image Deconvolution Back-Projection (IDBP) to retrieve high frequency energy radiation of seismic sources by linear inversion of observed images from a back-projection approach. The observed back-projection image for multiple sources is considered as a convolution of the image of the true radiated energy and the array response for a point source. The array response that spreads energy both in space and time is evaluated by using data of a smaller reference earthquake that can be assumed to be a point source. The synthetic test of the method shows that the spatial and temporal resolution of the source is much better than that for the conventional back-projection method. We applied this new method to the 2001 M w 7.8 Kunlun earthquake using data recorded by Hi-net in Japan. The new method resolves a sharp image of the high frequency energy radiation with a significant portion of supershear rupture. [ABSTRACT FROM AUTHOR]
- Subjects :
- *EARTHQUAKES
*REAR-screen projection
*RADIATION
*SEISMIC waves
*DATA analysis
Subjects
Details
- Language :
- English
- ISSN :
- 0012821X
- Volume :
- 449
- Database :
- Academic Search Index
- Journal :
- Earth & Planetary Science Letters
- Publication Type :
- Academic Journal
- Accession number :
- 116629779
- Full Text :
- https://doi.org/10.1016/j.epsl.2016.05.051